The Department of Developmental Services is responsible for the operation and maintenance of the facilities under its control, including the three state-owned and operated 24-hour care facilities and their buildings, grounds, and infrastructure. These Developmental Centers are: Fairview (Orange County), Porterville (Tulare County), and Sonoma (Sonoma County); these three facilities comprise approximately 3.6 million gross square feet on 1,646 acres. The facilities are used to aid the Department's mission to provide medical, dental, and nursing care; supervision; active treatment; and education and vocational training for residents with developmental disabilities. The Department also leases one small state-operated community facility but is not responsible for infrastructure or maintenance of this facility. The Lanterman Developmental Center closed in December 2014 and no longer serves as a residential health facility.